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[ms-inline-asm] Implement _emit directive (which is roughly equivalent to .byte).

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<rdar://problem/12470345>.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166451 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eli Friedman 2012-10-22 23:58:19 +00:00
parent 8f47fc8f00
commit 2128aaebd8
2 changed files with 68 additions and 47 deletions
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3
include/llvm/MC/MCParser/MCAsmParser.h
View File

@ -97,9 +97,6 @@ public:
const MCInstPrinter *IP,
MCAsmParserSemaCallback &SI) = 0;
/// ParseStatement - Parse the next statement.
virtual bool ParseStatement() = 0;
/// Warning - Emit a warning at the location \p L, with the message \p Msg.
///
/// \return The return value is true, if warnings are fatal.

112
lib/MC/MCParser/AsmParser.cpp
View File

@ -86,6 +86,28 @@ public:
MemoryBuffer *I);
};
struct AsmRewrite;
struct ParseStatementInfo {
/// ParsedOperands - The parsed operands from the last parsed statement.
SmallVector<MCParsedAsmOperand*, 8> ParsedOperands;
/// Opcode - The opcode from the last parsed instruction.
unsigned Opcode;
SmallVectorImpl<AsmRewrite> *AsmRewrites;
ParseStatementInfo() : Opcode(~0U), AsmRewrites(0) {}
ParseStatementInfo(SmallVectorImpl<AsmRewrite> *rewrites)
: Opcode(~0), AsmRewrites(rewrites) {}
~ParseStatementInfo() {
// Free any parsed operands.
for (unsigned i = 0, e = ParsedOperands.size(); i != e; ++i)
delete ParsedOperands[i];
ParsedOperands.clear();
}
};
/// \brief The concrete assembly parser instance.
class AsmParser : public MCAsmParser {
friend class GenericAsmParser;
@ -142,13 +164,6 @@ private:
/// ParsingInlineAsm - Are we parsing ms-style inline assembly?
bool ParsingInlineAsm;
/// ParsedOperands - The parsed operands from the last parsed statement.
SmallVector<MCParsedAsmOperand*, 8> ParsedOperands;
/// Opcode - The opcode from the last parsed instruction. This is MS-style
/// inline asm specific.
unsigned Opcode;
public:
AsmParser(SourceMgr &SM, MCContext &Ctx, MCStreamer &Out,
const MCAsmInfo &MAI);
@ -209,7 +224,7 @@ public:
private:
void CheckForValidSection();
bool ParseStatement();
bool ParseStatement(ParseStatementInfo &Info);
void EatToEndOfLine();
bool ParseCppHashLineFilenameComment(const SMLoc &L);
@ -316,10 +331,8 @@ private:
bool ParseDirectiveIrpc(SMLoc DirectiveLoc); // ".irpc"
bool ParseDirectiveEndr(SMLoc DirectiveLoc); // ".endr"
// MS-style inline assembly parsing.
bool isInstruction() { return Opcode != (unsigned)~0x0; }
unsigned getOpcode() { return Opcode; }
void setOpcode(unsigned Value) { Opcode = Value; }
// "_emit"
bool ParseDirectiveEmit(SMLoc DirectiveLoc, ParseStatementInfo &Info);
};
/// \brief Generic implementations of directive handling, etc. which is shared
@ -445,8 +458,7 @@ AsmParser::AsmParser(SourceMgr &_SM, MCContext &_Ctx,
: Lexer(_MAI), Ctx(_Ctx), Out(_Out), MAI(_MAI), SrcMgr(_SM),
GenericParser(new GenericAsmParser), PlatformParser(0),
CurBuffer(0), MacrosEnabled(true), CppHashLineNumber(0),
AssemblerDialect(~0U), IsDarwin(false), ParsingInlineAsm(false),
Opcode(~0x0) {
AssemblerDialect(~0U), IsDarwin(false), ParsingInlineAsm(false) {
// Save the old handler.
SavedDiagHandler = SrcMgr.getDiagHandler();
SavedDiagContext = SrcMgr.getDiagContext();
@ -585,7 +597,8 @@ bool AsmParser::Run(bool NoInitialTextSection, bool NoFinalize) {
// While we have input, parse each statement.
while (Lexer.isNot(AsmToken::Eof)) {
if (!ParseStatement()) continue;
ParseStatementInfo Info;
if (!ParseStatement(Info)) continue;
// We had an error, validate that one was emitted and recover by skipping to
// the next line.
@ -1068,7 +1081,7 @@ bool AsmParser::ParseBinOpRHS(unsigned Precedence, const MCExpr *&Res,
/// ::= EndOfStatement
/// ::= Label* Directive ...Operands... EndOfStatement
/// ::= Label* Identifier OperandList* EndOfStatement
bool AsmParser::ParseStatement() {
bool AsmParser::ParseStatement(ParseStatementInfo &Info) {
if (Lexer.is(AsmToken::EndOfStatement)) {
Out.AddBlankLine();
Lex();
@ -1187,7 +1200,7 @@ bool AsmParser::ParseStatement() {
return false;
}
return ParseStatement();
return false;
}
case AsmToken::Equal:
@ -1341,6 +1354,10 @@ bool AsmParser::ParseStatement() {
return Error(IDLoc, "unknown directive");
}
// _emit
if (ParsingInlineAsm && IDVal == "_emit")
return ParseDirectiveEmit(IDLoc, Info);
CheckForValidSection();
// Canonicalize the opcode to lower case.
@ -1349,17 +1366,17 @@ bool AsmParser::ParseStatement() {
OpcodeStr.push_back(tolower(IDVal[i]));
bool HadError = getTargetParser().ParseInstruction(OpcodeStr.str(), IDLoc,
ParsedOperands);
Info.ParsedOperands);
// Dump the parsed representation, if requested.
if (getShowParsedOperands()) {
SmallString<256> Str;
raw_svector_ostream OS(Str);
OS << "parsed instruction: [";
for (unsigned i = 0; i != ParsedOperands.size(); ++i) {
for (unsigned i = 0; i != Info.ParsedOperands.size(); ++i) {
if (i != 0)
OS << ", ";
ParsedOperands[i]->print(OS);
Info.ParsedOperands[i]->print(OS);
}
OS << "]";
@ -1381,20 +1398,12 @@ bool AsmParser::ParseStatement() {
// If parsing succeeded, match the instruction.
if (!HadError) {
unsigned ErrorInfo;
HadError = getTargetParser().MatchAndEmitInstruction(IDLoc, Opcode,
ParsedOperands, Out,
ErrorInfo,
HadError = getTargetParser().MatchAndEmitInstruction(IDLoc, Info.Opcode,
Info.ParsedOperands,
Out, ErrorInfo,
ParsingInlineAsm);
}
// Free any parsed operands. If parsing ms-style inline assembly the operands
// will be freed by the ParseMSInlineAsm() function.
if (!ParsingInlineAsm) {
for (unsigned i = 0, e = ParsedOperands.size(); i != e; ++i)
delete ParsedOperands[i];
ParsedOperands.clear();
}
// Don't skip the rest of the line, the instruction parser is responsible for
// that.
return false;
@ -3579,7 +3588,8 @@ enum AsmRewriteKind {
AOK_Imm,
AOK_Input,
AOK_Output,
AOK_SizeDirective
AOK_SizeDirective,
AOK_Emit
};
struct AsmRewrite {
@ -3593,6 +3603,22 @@ public:
};
}
bool AsmParser::ParseDirectiveEmit(SMLoc IDLoc, ParseStatementInfo &Info) {
const MCExpr *Value;
SMLoc ExprLoc = getLexer().getLoc();
if (ParseExpression(Value))
return true;
const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value);
if (!MCE)
return Error(ExprLoc, "unexpected expression in _emit");
uint64_t IntValue = MCE->getValue();
if (!isUIntN(8, IntValue) && !isIntN(8, IntValue))
return Error(ExprLoc, "literal value out of range for directive");
Info.AsmRewrites->push_back(AsmRewrite(AOK_Emit, IDLoc, 5));
return false;
}
bool AsmParser::ParseMSInlineAsm(void *AsmLoc, std::string &AsmString,
unsigned &NumOutputs, unsigned &NumInputs,
SmallVectorImpl<void *> &OpDecls,
@ -3616,18 +3642,16 @@ bool AsmParser::ParseMSInlineAsm(void *AsmLoc, std::string &AsmString,
unsigned InputIdx = 0;
unsigned OutputIdx = 0;
while (getLexer().isNot(AsmToken::Eof)) {
// Clear the opcode.
setOpcode(~0x0);
if (ParseStatement())
ParseStatementInfo Info(&AsmStrRewrites);
if (ParseStatement(Info))
return true;
if (isInstruction()) {
const MCInstrDesc &Desc = MII->get(getOpcode());
if (Info.Opcode != ~0U) {
const MCInstrDesc &Desc = MII->get(Info.Opcode);
// Build the list of clobbers, outputs and inputs.
for (unsigned i = 1, e = ParsedOperands.size(); i != e; ++i) {
MCParsedAsmOperand *Operand = ParsedOperands[i];
for (unsigned i = 1, e = Info.ParsedOperands.size(); i != e; ++i) {
MCParsedAsmOperand *Operand = Info.ParsedOperands[i];
// Immediate.
if (Operand->isImm()) {
@ -3679,10 +3703,6 @@ bool AsmParser::ParseMSInlineAsm(void *AsmLoc, std::string &AsmString,
}
}
}
// Free any parsed operands.
for (unsigned i = 0, e = ParsedOperands.size(); i != e; ++i)
delete ParsedOperands[i];
ParsedOperands.clear();
}
}
@ -3751,6 +3771,10 @@ bool AsmParser::ParseMSInlineAsm(void *AsmLoc, std::string &AsmString,
case 128: OS << "xmmword ptr "; break;
case 256: OS << "ymmword ptr "; break;
}
break;
case AOK_Emit:
OS << ".byte";
break;
}
// Skip the original expression.